views: Move widget/ directory to ui/views.

BUG=104039
R=ben@chromium.org

Review URL: http://codereview.chromium.org/8598031

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110949 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 2317 insertions, 0 deletions

diff --git a/ui/views/widget/native_widget_gtk.cc b/ui/views/widget/native_widget_gtk.cc
new file mode 100644
index 0000000..8da0f51
--- /dev/null
+++ b/ui/views/widget/native_widget_gtk.cc
@@ -0,0 +1,2317 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/views/widget/native_widget_gtk.h"
+
+#include <X11/Xatom.h>
+#include <X11/Xlib.h>
+#include <X11/extensions/shape.h>
+#include <gdk/gdk.h>
+#include <gdk/gdkx.h>
+
+#include <set>
+#include <vector>
+
+#include "base/auto_reset.h"
+#include "base/bind.h"
+#include "base/compiler_specific.h"
+#include "base/message_loop.h"
+#include "base/utf_string_conversions.h"
+#include "ui/base/dragdrop/drag_drop_types.h"
+#include "ui/base/dragdrop/os_exchange_data.h"
+#include "ui/base/dragdrop/os_exchange_data_provider_gtk.h"
+#include "ui/base/gtk/g_object_destructor_filo.h"
+#include "ui/base/gtk/gtk_signal_registrar.h"
+#include "ui/base/gtk/gtk_windowing.h"
+#include "ui/base/gtk/scoped_handle_gtk.h"
+#include "ui/base/hit_test.h"
+#include "ui/base/x/x11_util.h"
+#include "ui/gfx/canvas_skia_paint.h"
+#include "ui/gfx/compositor/compositor.h"
+#include "ui/gfx/gtk_util.h"
+#include "ui/gfx/path.h"
+#include "ui/gfx/screen.h"
+#include "ui/views/bubble/bubble_delegate.h"
+#include "ui/views/focus/view_storage.h"
+#include "ui/views/ime/input_method_gtk.h"
+#include "ui/views/widget/drop_target_gtk.h"
+#include "ui/views/widget/drop_target_gtk.h"
+#include "ui/views/widget/gtk_views_fixed.h"
+#include "ui/views/widget/gtk_views_fixed.h"
+#include "ui/views/widget/gtk_views_window.h"
+#include "ui/views/widget/gtk_views_window.h"
+#include "ui/views/widget/root_view.h"
+#include "ui/views/widget/root_view.h"
+#include "ui/views/widget/widget_delegate.h"
+#include "ui/views/widget/widget_delegate.h"
+#include "views/controls/textfield/native_textfield_views.h"
+#include "views/views_delegate.h"
+
+#if defined(TOUCH_UI)
+#include "ui/base/touch/touch_factory.h"
+#include "ui/views/widget/tooltip_manager_views.h"
+#else
+#include "ui/views/widget/tooltip_manager_gtk.h"
+#endif
+
+#if defined(HAVE_IBUS)
+#include "ui/views/ime/input_method_ibus.h"
+#endif
+
+using ui::OSExchangeData;
+using ui::OSExchangeDataProviderGtk;
+using ui::ActiveWindowWatcherX;
+
+namespace views {
+
+namespace {
+
+// Links the GtkWidget to its NativeWidget.
+const char* const kNativeWidgetKey = "__VIEWS_NATIVE_WIDGET__";
+
+// A g_object data key to associate a CompositePainter object to a GtkWidget.
+const char* kCompositePainterKey = "__VIEWS_COMPOSITE_PAINTER__";
+
+// A g_object data key to associate the flag whether or not the widget
+// is composited to a GtkWidget. gtk_widget_is_composited simply tells
+// if x11 supports composition and cannot be used to tell if given widget
+// is composited.
+const char* kCompositeEnabledKey = "__VIEWS_COMPOSITE_ENABLED__";
+
+// A g_object data key to associate the expose handler id that is
+// used to remove FREEZE_UPDATE property on the window.
+const char* kExposeHandlerIdKey = "__VIEWS_EXPOSE_HANDLER_ID__";
+
+// CompositePainter draws a composited child widgets image into its
+// drawing area. This object is created at most once for a widget and kept
+// until the widget is destroyed.
+class CompositePainter {
+ public:
+  explicit CompositePainter(GtkWidget* parent)
+      : parent_object_(G_OBJECT(parent)) {
+    handler_id_ = g_signal_connect_after(
+        parent_object_, "expose_event", G_CALLBACK(OnCompositePaint), NULL);
+  }
+
+  static void AddCompositePainter(GtkWidget* widget) {
+    CompositePainter* painter = static_cast<CompositePainter*>(
+        g_object_get_data(G_OBJECT(widget), kCompositePainterKey));
+    if (!painter) {
+      g_object_set_data(G_OBJECT(widget), kCompositePainterKey,
+                        new CompositePainter(widget));
+      g_signal_connect(widget, "destroy",
+                       G_CALLBACK(&DestroyPainter), NULL);
+    }
+  }
+
+  // Set the composition flag.
+  static void SetComposited(GtkWidget* widget) {
+    g_object_set_data(G_OBJECT(widget), kCompositeEnabledKey,
+                      const_cast<char*>(""));
+  }
+
+  // Returns true if the |widget| is composited and ready to be drawn.
+  static bool IsComposited(GtkWidget* widget) {
+    return g_object_get_data(G_OBJECT(widget), kCompositeEnabledKey) != NULL;
+  }
+
+ private:
+  virtual ~CompositePainter() {}
+
+  // Composes a image from one child.
+  static void CompositeChildWidget(GtkWidget* child, gpointer data) {
+    GdkEventExpose* event = static_cast<GdkEventExpose*>(data);
+    GtkWidget* parent = gtk_widget_get_parent(child);
+    DCHECK(parent);
+    if (IsComposited(child)) {
+      cairo_t* cr = gdk_cairo_create(parent->window);
+      gdk_cairo_set_source_pixmap(cr, child->window,
+                                  child->allocation.x,
+                                  child->allocation.y);
+      GdkRegion* region = gdk_region_rectangle(&child->allocation);
+      gdk_region_intersect(region, event->region);
+      gdk_cairo_region(cr, region);
+      cairo_clip(cr);
+      cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
+      cairo_paint(cr);
+      cairo_destroy(cr);
+    }
+  }
+
+  // Expose-event handler that compose & draws children's image into
+  // the |parent|'s drawing area.
+  static gboolean OnCompositePaint(GtkWidget* parent, GdkEventExpose* event) {
+    gtk_container_foreach(GTK_CONTAINER(parent),
+                          CompositeChildWidget,
+                          event);
+    return false;
+  }
+
+  static void DestroyPainter(GtkWidget* object) {
+    CompositePainter* painter = reinterpret_cast<CompositePainter*>(
+        g_object_get_data(G_OBJECT(object), kCompositePainterKey));
+    DCHECK(painter);
+    delete painter;
+  }
+
+  GObject* parent_object_;
+  gulong handler_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(CompositePainter);
+};
+
+void EnumerateChildWidgetsForNativeWidgets(GtkWidget* child_widget,
+                                           gpointer param) {
+  // Walk child widgets, if necessary.
+  if (GTK_IS_CONTAINER(child_widget)) {
+    gtk_container_foreach(GTK_CONTAINER(child_widget),
+                          EnumerateChildWidgetsForNativeWidgets,
+                          param);
+  }
+
+  Widget* widget = Widget::GetWidgetForNativeView(child_widget);
+  if (widget) {
+    Widget::Widgets* widgets = reinterpret_cast<Widget::Widgets*>(param);
+    widgets->insert(widget);
+  }
+}
+
+void RemoveExposeHandlerIfExists(GtkWidget* widget) {
+  gulong id = reinterpret_cast<gulong>(g_object_get_data(G_OBJECT(widget),
+                                                         kExposeHandlerIdKey));
+  if (id) {
+    g_signal_handler_disconnect(G_OBJECT(widget), id);
+    g_object_set_data(G_OBJECT(widget), kExposeHandlerIdKey, 0);
+  }
+}
+
+GtkWindowType WindowTypeToGtkWindowType(Widget::InitParams::Type type) {
+  switch (type) {
+    case Widget::InitParams::TYPE_BUBBLE:
+    case Widget::InitParams::TYPE_WINDOW:
+    case Widget::InitParams::TYPE_WINDOW_FRAMELESS:
+      return GTK_WINDOW_TOPLEVEL;
+    default:
+      return GTK_WINDOW_POPUP;
+  }
+  NOTREACHED();
+  return GTK_WINDOW_TOPLEVEL;
+}
+
+// Converts a Windows-style hit test result code into a GDK window edge.
+GdkWindowEdge HitTestCodeToGDKWindowEdge(int hittest_code) {
+  switch (hittest_code) {
+    case HTBOTTOM:
+      return GDK_WINDOW_EDGE_SOUTH;
+    case HTBOTTOMLEFT:
+      return GDK_WINDOW_EDGE_SOUTH_WEST;
+    case HTBOTTOMRIGHT:
+    case HTGROWBOX:
+      return GDK_WINDOW_EDGE_SOUTH_EAST;
+    case HTLEFT:
+      return GDK_WINDOW_EDGE_WEST;
+    case HTRIGHT:
+      return GDK_WINDOW_EDGE_EAST;
+    case HTTOP:
+      return GDK_WINDOW_EDGE_NORTH;
+    case HTTOPLEFT:
+      return GDK_WINDOW_EDGE_NORTH_WEST;
+    case HTTOPRIGHT:
+      return GDK_WINDOW_EDGE_NORTH_EAST;
+    default:
+      NOTREACHED();
+      break;
+  }
+  // Default to something defaultish.
+  return HitTestCodeToGDKWindowEdge(HTGROWBOX);
+}
+
+// Converts a Windows-style hit test result code into a GDK cursor type.
+GdkCursorType HitTestCodeToGdkCursorType(int hittest_code) {
+  switch (hittest_code) {
+    case HTBOTTOM:
+      return GDK_BOTTOM_SIDE;
+    case HTBOTTOMLEFT:
+      return GDK_BOTTOM_LEFT_CORNER;
+    case HTBOTTOMRIGHT:
+    case HTGROWBOX:
+      return GDK_BOTTOM_RIGHT_CORNER;
+    case HTLEFT:
+      return GDK_LEFT_SIDE;
+    case HTRIGHT:
+      return GDK_RIGHT_SIDE;
+    case HTTOP:
+      return GDK_TOP_SIDE;
+    case HTTOPLEFT:
+      return GDK_TOP_LEFT_CORNER;
+    case HTTOPRIGHT:
+      return GDK_TOP_RIGHT_CORNER;
+    default:
+      break;
+  }
+  // Default to something defaultish.
+  return GDK_LEFT_PTR;
+}
+
+}  // namespace
+
+// During drag and drop GTK sends a drag-leave during a drop. This means we
+// have no way to tell the difference between a normal drag leave and a drop.
+// To work around that we listen for DROP_START, then ignore the subsequent
+// drag-leave that GTK generates.
+class NativeWidgetGtk::DropObserver : public MessageLoopForUI::Observer {
+ public:
+  DropObserver() {}
+
+  static DropObserver* GetInstance() {
+    return Singleton<DropObserver>::get();
+  }
+#if defined(TOUCH_UI)
+  virtual base::EventStatus WillProcessEvent(
+      const base::NativeEvent& event) OVERRIDE {
+    return base::EVENT_CONTINUE;
+  }
+
+  virtual void DidProcessEvent(const base::NativeEvent& event) OVERRIDE {
+  }
+#else
+  virtual void WillProcessEvent(GdkEvent* event) {
+    if (event->type == GDK_DROP_START) {
+      NativeWidgetGtk* widget = GetNativeWidgetGtkForEvent(event);
+      if (widget)
+        widget->ignore_drag_leave_ = true;
+    }
+  }
+
+  virtual void DidProcessEvent(GdkEvent* event) {
+  }
+#endif
+
+ private:
+  NativeWidgetGtk* GetNativeWidgetGtkForEvent(GdkEvent* event) {
+    GtkWidget* gtk_widget = gtk_get_event_widget(event);
+    if (!gtk_widget)
+      return NULL;
+
+    return static_cast<NativeWidgetGtk*>(
+        internal::NativeWidgetPrivate::GetNativeWidgetForNativeView(
+            gtk_widget));
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(DropObserver);
+};
+
+// Returns the position of a widget on screen.
+static void GetWidgetPositionOnScreen(GtkWidget* widget, int* x, int *y) {
+  // First get the root window.
+  GtkWidget* root = widget;
+  while (root && !GTK_IS_WINDOW(root)) {
+    root = gtk_widget_get_parent(root);
+  }
+  if (!root) {
+    // If root is null we're not parented. Return 0x0 and assume the caller will
+    // query again when we're parented.
+    *x = *y = 0;
+    return;
+  }
+  // Translate the coordinate from widget to root window.
+  gtk_widget_translate_coordinates(widget, root, 0, 0, x, y);
+  // Then adjust the position with the position of the root window.
+  int window_x, window_y;
+  gtk_window_get_position(GTK_WINDOW(root), &window_x, &window_y);
+  *x += window_x;
+  *y += window_y;
+}
+
+// "expose-event" handler of drag icon widget that renders drag image pixbuf.
+static gboolean DragIconWidgetPaint(GtkWidget* widget,
+                                    GdkEventExpose* event,
+                                    gpointer data) {
+  GdkPixbuf* pixbuf = reinterpret_cast<GdkPixbuf*>(data);
+
+  cairo_t* cr = gdk_cairo_create(widget->window);
+
+  gdk_cairo_region(cr, event->region);
+  cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+  gdk_cairo_set_source_pixbuf(cr, pixbuf, 0.0, 0.0);
+  cairo_paint(cr);
+
+  cairo_destroy(cr);
+  return true;
+}
+
+// Creates a drag icon widget that draws drag_image.
+static GtkWidget* CreateDragIconWidget(GdkPixbuf* drag_image) {
+  GdkColormap* rgba_colormap =
+      gdk_screen_get_rgba_colormap(gdk_screen_get_default());
+  if (!rgba_colormap)
+    return NULL;
+
+  GtkWidget* drag_widget = gtk_window_new(GTK_WINDOW_POPUP);
+
+  gtk_widget_set_colormap(drag_widget, rgba_colormap);
+  gtk_widget_set_app_paintable(drag_widget, true);
+  gtk_widget_set_size_request(drag_widget,
+                              gdk_pixbuf_get_width(drag_image),
+                              gdk_pixbuf_get_height(drag_image));
+
+  g_signal_connect(G_OBJECT(drag_widget), "expose-event",
+                   G_CALLBACK(&DragIconWidgetPaint), drag_image);
+  return drag_widget;
+}
+
+// static
+GtkWidget* NativeWidgetGtk::null_parent_ = NULL;
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetGtk, public:
+
+NativeWidgetGtk::NativeWidgetGtk(internal::NativeWidgetDelegate* delegate)
+    : delegate_(delegate),
+      widget_(NULL),
+      window_contents_(NULL),
+      child_(false),
+      ALLOW_THIS_IN_INITIALIZER_LIST(close_widget_factory_(this)),
+      ownership_(Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET),
+      transparent_(false),
+      ignore_events_(false),
+      ignore_drag_leave_(false),
+      opacity_(255),
+      drag_data_(NULL),
+      window_state_(GDK_WINDOW_STATE_WITHDRAWN),
+      is_active_(false),
+      transient_to_parent_(false),
+      got_initial_focus_in_(false),
+      has_focus_(false),
+      always_on_top_(false),
+      is_double_buffered_(false),
+      should_handle_menu_key_release_(false),
+      dragged_view_(NULL),
+      painted_(false),
+      has_pointer_grab_(false),
+      has_keyboard_grab_(false),
+      grab_notify_signal_id_(0),
+      is_menu_(false),
+      signal_registrar_(new ui::GtkSignalRegistrar) {
+#if defined(TOUCH_UI)
+  // Make sure the touch factory is initialized so that it can setup XInput2 for
+  // the widget.
+  ui::TouchFactory::GetInstance();
+#endif
+  static bool installed_message_loop_observer = false;
+  if (!installed_message_loop_observer) {
+    installed_message_loop_observer = true;
+    MessageLoopForUI* loop = MessageLoopForUI::current();
+    if (loop)
+      loop->AddObserver(DropObserver::GetInstance());
+  }
+}
+
+NativeWidgetGtk::~NativeWidgetGtk() {
+  // We need to delete the input method before calling DestroyRootView(),
+  // because it'll set focus_manager_ to NULL.
+  if (ownership_ == Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET) {
+    DCHECK(widget_ == NULL);
+    delete delegate_;
+  } else {
+    // Disconnect from GObjectDestructorFILO because we're
+    // deleting the NativeWidgetGtk.
+    bool has_widget = !!widget_;
+    if (has_widget)
+      ui::GObjectDestructorFILO::GetInstance()->Disconnect(
+          G_OBJECT(widget_), &OnDestroyedThunk, this);
+    CloseNow();
+    // Call OnNativeWidgetDestroyed because we're not calling
+    // OnDestroyedThunk
+    if (has_widget)
+      delegate_->OnNativeWidgetDestroyed();
+  }
+}
+
+GtkWindow* NativeWidgetGtk::GetTransientParent() const {
+  return (!child_ && widget_) ?
+      gtk_window_get_transient_for(GTK_WINDOW(widget_)) : NULL;
+}
+
+bool NativeWidgetGtk::MakeTransparent() {
+  // Transparency can only be enabled only if we haven't realized the widget.
+  DCHECK(!widget_);
+
+  if (!gdk_screen_is_composited(gdk_screen_get_default())) {
+    // Transparency is only supported for compositing window managers.
+    // NOTE: there's a race during ChromeOS startup such that X might think
+    // compositing isn't supported. We ignore it if the wm says compositing
+    // isn't supported.
+    DLOG(WARNING) << "compositing not supported; allowing anyway";
+  }
+
+  if (!gdk_screen_get_rgba_colormap(gdk_screen_get_default())) {
+    // We need rgba to make the window transparent.
+    return false;
+  }
+
+  transparent_ = true;
+  return true;
+}
+
+void NativeWidgetGtk::EnableDoubleBuffer(bool enabled) {
+  is_double_buffered_ = enabled;
+  if (window_contents_) {
+    if (is_double_buffered_)
+      GTK_WIDGET_SET_FLAGS(window_contents_, GTK_DOUBLE_BUFFERED);
+    else
+      GTK_WIDGET_UNSET_FLAGS(window_contents_, GTK_DOUBLE_BUFFERED);
+  }
+}
+
+void NativeWidgetGtk::AddChild(GtkWidget* child) {
+  gtk_container_add(GTK_CONTAINER(window_contents_), child);
+}
+
+void NativeWidgetGtk::RemoveChild(GtkWidget* child) {
+  // We can be called after the contents widget has been destroyed, e.g. any
+  // NativeViewHost not removed from the view hierarchy before the window is
+  // closed.
+  if (GTK_IS_CONTAINER(window_contents_)) {
+    gtk_container_remove(GTK_CONTAINER(window_contents_), child);
+    gtk_views_fixed_set_widget_size(child, 0, 0);
+  }
+}
+
+void NativeWidgetGtk::ReparentChild(GtkWidget* child) {
+  gtk_widget_reparent(child, window_contents_);
+}
+
+void NativeWidgetGtk::PositionChild(GtkWidget* child, int x, int y, int w,
+                                    int h) {
+  gtk_views_fixed_set_widget_size(child, w, h);
+  gtk_fixed_move(GTK_FIXED(window_contents_), child, x, y);
+}
+
+void NativeWidgetGtk::DoDrag(const OSExchangeData& data, int operation) {
+  const OSExchangeDataProviderGtk& data_provider =
+      static_cast<const OSExchangeDataProviderGtk&>(data.provider());
+  GtkTargetList* targets = data_provider.GetTargetList();
+  GdkEvent* current_event = gtk_get_current_event();
+  const OSExchangeDataProviderGtk& provider(
+      static_cast<const OSExchangeDataProviderGtk&>(data.provider()));
+
+  GdkDragContext* context = gtk_drag_begin(
+      window_contents_,
+      targets,
+      static_cast<GdkDragAction>(
+          ui::DragDropTypes::DragOperationToGdkDragAction(operation)),
+      1,
+      current_event);
+
+  GtkWidget* drag_icon_widget = NULL;
+
+  // Set the drag image if one was supplied.
+  if (provider.drag_image()) {
+    drag_icon_widget = CreateDragIconWidget(provider.drag_image());
+    if (drag_icon_widget) {
+      // Use a widget as the drag icon when compositing is enabled for proper
+      // transparency handling.
+      g_object_ref(provider.drag_image());
+      gtk_drag_set_icon_widget(context,
+                               drag_icon_widget,
+                               provider.cursor_offset().x(),
+                               provider.cursor_offset().y());
+    } else {
+      gtk_drag_set_icon_pixbuf(context,
+                               provider.drag_image(),
+                               provider.cursor_offset().x(),
+                               provider.cursor_offset().y());
+    }
+  }
+
+  if (current_event)
+    gdk_event_free(current_event);
+  gtk_target_list_unref(targets);
+
+  drag_data_ = &data_provider;
+
+  // Block the caller until drag is done by running a nested message loop.
+  MessageLoopForUI::current()->RunWithDispatcher(NULL);
+
+  drag_data_ = NULL;
+
+  if (drag_icon_widget) {
+    gtk_widget_destroy(drag_icon_widget);
+    g_object_unref(provider.drag_image());
+  }
+}
+
+void NativeWidgetGtk::OnActiveChanged() {
+  delegate_->OnNativeWidgetActivationChanged(IsActive());
+}
+
+void NativeWidgetGtk::ResetDropTarget() {
+  ignore_drag_leave_ = false;
+  drop_target_.reset(NULL);
+}
+
+void NativeWidgetGtk::GetRequestedSize(gfx::Size* out) const {
+  int width, height;
+  if (GTK_IS_VIEWS_FIXED(widget_) &&
+      gtk_views_fixed_get_widget_size(GetNativeView(), &width, &height)) {
+    out->SetSize(width, height);
+  } else {
+    GtkRequisition requisition;
+    gtk_widget_get_child_requisition(GetNativeView(), &requisition);
+    out->SetSize(requisition.width, requisition.height);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetGtk, ActiveWindowWatcherX::Observer implementation:
+
+void NativeWidgetGtk::ActiveWindowChanged(GdkWindow* active_window) {
+  if (!GetNativeView())
+    return;
+
+  bool was_active = IsActive();
+  is_active_ = (active_window == GTK_WIDGET(GetNativeView())->window);
+  if (!is_active_ && active_window && !child_) {
+    // We're not active, but the force the window to be rendered as active if
+    // a child window is transient to us.
+    gpointer data = NULL;
+    gdk_window_get_user_data(active_window, &data);
+    GtkWidget* widget = reinterpret_cast<GtkWidget*>(data);
+    is_active_ =
+        (widget && GTK_IS_WINDOW(widget) &&
+         gtk_window_get_transient_for(GTK_WINDOW(widget)) == GTK_WINDOW(
+             widget_));
+  }
+  if (was_active != IsActive()) {
+    OnActiveChanged();
+    GetWidget()->GetRootView()->SchedulePaint();
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetGtk implementation:
+
+bool NativeWidgetGtk::HandleKeyboardEvent(const KeyEvent& key) {
+  if (!GetWidget()->GetFocusManager())
+    return false;
+
+  const int key_code = key.key_code();
+  bool handled = false;
+
+  // Always reset |should_handle_menu_key_release_| unless we are handling a
+  // VKEY_MENU key release event. It ensures that VKEY_MENU accelerator can only
+  // be activated when handling a VKEY_MENU key release event which is preceded
+  // by an un-handled VKEY_MENU key press event.
+  if (key_code != ui::VKEY_MENU || key.type() != ui::ET_KEY_RELEASED)
+    should_handle_menu_key_release_ = false;
+
+  if (key.type() == ui::ET_KEY_PRESSED) {
+    // VKEY_MENU is triggered by key release event.
+    // FocusManager::OnKeyEvent() returns false when the key has been consumed.
+    if (key_code != ui::VKEY_MENU)
+      handled = !GetWidget()->GetFocusManager()->OnKeyEvent(key);
+    else
+      should_handle_menu_key_release_ = true;
+  } else if (key_code == ui::VKEY_MENU && should_handle_menu_key_release_ &&
+             (key.flags() & ~ui::EF_ALT_DOWN) == 0) {
+    // Trigger VKEY_MENU when only this key is pressed and released, and both
+    // press and release events are not handled by others.
+    ui::Accelerator accelerator(ui::VKEY_MENU, false, false, false);
+    handled = GetWidget()->GetFocusManager()->ProcessAccelerator(accelerator);
+  }
+
+  return handled;
+}
+
+bool NativeWidgetGtk::SuppressFreezeUpdates() {
+  if (!painted_) {
+    painted_ = true;
+    return true;
+  }
+  return false;
+}
+
+// static
+void NativeWidgetGtk::UpdateFreezeUpdatesProperty(GtkWindow* window,
+                                                  bool enable) {
+  if (!GTK_WIDGET_REALIZED(GTK_WIDGET(window)))
+    gtk_widget_realize(GTK_WIDGET(window));
+  GdkWindow* gdk_window = GTK_WIDGET(window)->window;
+
+  static GdkAtom freeze_atom_ =
+      gdk_atom_intern("_CHROME_FREEZE_UPDATES", FALSE);
+  if (enable) {
+    VLOG(1) << "setting FREEZE UPDATES property. xid=" <<
+        GDK_WINDOW_XID(gdk_window);
+    int32 val = 1;
+    gdk_property_change(gdk_window,
+                        freeze_atom_,
+                        freeze_atom_,
+                        32,
+                        GDK_PROP_MODE_REPLACE,
+                        reinterpret_cast<const guchar*>(&val),
+                        1);
+  } else {
+    VLOG(1) << "deleting FREEZE UPDATES property. xid=" <<
+        GDK_WINDOW_XID(gdk_window);
+    gdk_property_delete(gdk_window, freeze_atom_);
+  }
+}
+
+// static
+void NativeWidgetGtk::RegisterChildExposeHandler(GtkWidget* child) {
+  RemoveExposeHandlerIfExists(child);
+  gulong id = g_signal_connect_after(child, "expose-event",
+                                     G_CALLBACK(&ChildExposeHandler), NULL);
+  g_object_set_data(G_OBJECT(child), kExposeHandlerIdKey,
+                    reinterpret_cast<void*>(id));
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetGtk, NativeWidget implementation:
+
+void NativeWidgetGtk::InitNativeWidget(const Widget::InitParams& params) {
+  SetInitParams(params);
+
+  Widget::InitParams modified_params = params;
+  if (params.parent_widget) {
+    NativeWidgetGtk* parent_gtk =
+        static_cast<NativeWidgetGtk*>(params.parent_widget->native_widget());
+    modified_params.parent = child_ ? parent_gtk->window_contents()
+                                    : params.parent_widget->GetNativeView();
+  }
+
+  if (!child_)
+    ActiveWindowWatcherX::AddObserver(this);
+
+  // Make container here.
+  CreateGtkWidget(modified_params);
+
+  if (params.type == Widget::InitParams::TYPE_MENU) {
+    gtk_window_set_destroy_with_parent(GTK_WINDOW(GetNativeView()), TRUE);
+    gtk_window_set_type_hint(GTK_WINDOW(GetNativeView()),
+                             GDK_WINDOW_TYPE_HINT_MENU);
+  }
+
+  if (View::get_use_acceleration_when_possible()) {
+    if (ui::Compositor::compositor_factory()) {
+      compositor_ = (*ui::Compositor::compositor_factory())(this);
+    } else {
+      gint width, height;
+      gdk_drawable_get_size(window_contents_->window, &width, &height);
+      compositor_ = ui::Compositor::Create(this,
+          GDK_WINDOW_XID(window_contents_->window),
+          gfx::Size(width, height));
+    }
+    if (compositor_.get()) {
+      View* root_view = delegate_->AsWidget()->GetRootView();
+      root_view->SetPaintToLayer(true);
+      compositor_->SetRootLayer(root_view->layer());
+      root_view->SetFillsBoundsOpaquely(!transparent_);
+    }
+  }
+
+  delegate_->OnNativeWidgetCreated();
+
+  if (opacity_ != 255)
+    SetOpacity(opacity_);
+
+  // Make sure we receive our motion events.
+
+  // In general we register most events on the parent of all widgets. At a
+  // minimum we need painting to happen on the parent (otherwise painting
+  // doesn't work at all), and similarly we need mouse release events on the
+  // parent as windows don't get mouse releases.
+  gtk_widget_add_events(window_contents_,
+                        GDK_ENTER_NOTIFY_MASK |
+                        GDK_LEAVE_NOTIFY_MASK |
+                        GDK_BUTTON_PRESS_MASK |
+                        GDK_BUTTON_RELEASE_MASK |
+                        GDK_POINTER_MOTION_MASK |
+                        GDK_KEY_PRESS_MASK |
+                        GDK_KEY_RELEASE_MASK);
+
+  signal_registrar_->ConnectAfter(G_OBJECT(window_contents_), "size_request",
+                                  G_CALLBACK(&OnSizeRequestThunk), this);
+  signal_registrar_->ConnectAfter(G_OBJECT(window_contents_), "size_allocate",
+                                  G_CALLBACK(&OnSizeAllocateThunk), this);
+  gtk_widget_set_app_paintable(window_contents_, true);
+  signal_registrar_->Connect(window_contents_, "expose_event",
+                             G_CALLBACK(&OnPaintThunk), this);
+  signal_registrar_->Connect(window_contents_, "enter_notify_event",
+                             G_CALLBACK(&OnEnterNotifyThunk), this);
+  signal_registrar_->Connect(window_contents_, "leave_notify_event",
+                             G_CALLBACK(&OnLeaveNotifyThunk), this);
+  signal_registrar_->Connect(window_contents_, "motion_notify_event",
+                             G_CALLBACK(&OnMotionNotifyThunk), this);
+  signal_registrar_->Connect(window_contents_, "button_press_event",
+                             G_CALLBACK(&OnButtonPressThunk), this);
+  signal_registrar_->Connect(window_contents_, "button_release_event",
+                             G_CALLBACK(&OnButtonReleaseThunk), this);
+  signal_registrar_->Connect(window_contents_, "grab_broken_event",
+                             G_CALLBACK(&OnGrabBrokeEventThunk), this);
+  signal_registrar_->Connect(window_contents_, "scroll_event",
+                             G_CALLBACK(&OnScrollThunk), this);
+  signal_registrar_->Connect(window_contents_, "visibility_notify_event",
+                             G_CALLBACK(&OnVisibilityNotifyThunk), this);
+
+  // In order to receive notification when the window is no longer the front
+  // window, we need to install these on the widget.
+  // NOTE: this doesn't work with focus follows mouse.
+  signal_registrar_->Connect(widget_, "focus_in_event",
+                             G_CALLBACK(&OnFocusInThunk), this);
+  signal_registrar_->Connect(widget_, "focus_out_event",
+                             G_CALLBACK(&OnFocusOutThunk), this);
+  signal_registrar_->Connect(widget_, "destroy",
+                             G_CALLBACK(&OnDestroyThunk), this);
+  signal_registrar_->Connect(widget_, "show",
+                             G_CALLBACK(&OnShowThunk), this);
+  signal_registrar_->Connect(widget_, "map",
+                             G_CALLBACK(&OnMapThunk), this);
+  signal_registrar_->Connect(widget_, "hide",
+                             G_CALLBACK(&OnHideThunk), this);
+  signal_registrar_->Connect(widget_, "configure-event",
+                             G_CALLBACK(&OnConfigureEventThunk), this);
+
+  // Views/FocusManager (re)sets the focus to the root window,
+  // so we need to connect signal handlers to the gtk window.
+  // See views::Views::Focus and views::FocusManager::ClearNativeFocus
+  // for more details.
+  signal_registrar_->Connect(widget_, "key_press_event",
+                             G_CALLBACK(&OnEventKeyThunk), this);
+  signal_registrar_->Connect(widget_, "key_release_event",
+                             G_CALLBACK(&OnEventKeyThunk), this);
+
+  // Drag and drop.
+  gtk_drag_dest_set(window_contents_, static_cast<GtkDestDefaults>(0),
+                    NULL, 0, GDK_ACTION_COPY);
+  signal_registrar_->Connect(window_contents_, "drag_motion",
+                             G_CALLBACK(&OnDragMotionThunk), this);
+  signal_registrar_->Connect(window_contents_, "drag_data_received",
+                             G_CALLBACK(&OnDragDataReceivedThunk), this);
+  signal_registrar_->Connect(window_contents_, "drag_drop",
+                             G_CALLBACK(&OnDragDropThunk), this);
+  signal_registrar_->Connect(window_contents_, "drag_leave",
+                             G_CALLBACK(&OnDragLeaveThunk), this);
+  signal_registrar_->Connect(window_contents_, "drag_data_get",
+                             G_CALLBACK(&OnDragDataGetThunk), this);
+  signal_registrar_->Connect(window_contents_, "drag_end",
+                             G_CALLBACK(&OnDragEndThunk), this);
+  signal_registrar_->Connect(window_contents_, "drag_failed",
+                             G_CALLBACK(&OnDragFailedThunk), this);
+  signal_registrar_->Connect(G_OBJECT(widget_), "window-state-event",
+                             G_CALLBACK(&OnWindowStateEventThunk), this);
+
+  ui::GObjectDestructorFILO::GetInstance()->Connect(
+      G_OBJECT(widget_), &OnDestroyedThunk, this);
+
+#if defined(TOUCH_UI)
+  if (params.type != Widget::InitParams::TYPE_TOOLTIP) {
+    views::TooltipManagerViews* manager = new views::TooltipManagerViews(
+        static_cast<internal::RootView*>(GetWidget()->GetRootView()));
+    tooltip_manager_.reset(manager);
+  }
+#else
+  tooltip_manager_.reset(new TooltipManagerGtk(this));
+#endif
+
+  // Register for tooltips.
+  g_object_set(G_OBJECT(window_contents_), "has-tooltip", TRUE, NULL);
+  signal_registrar_->Connect(window_contents_, "query_tooltip",
+                             G_CALLBACK(&OnQueryTooltipThunk), this);
+
+  if (child_) {
+    if (modified_params.parent)
+      SetBounds(params.bounds);
+  } else {
+    gtk_widget_add_events(widget_,
+                          GDK_STRUCTURE_MASK);
+    if (params.bounds.width() > 0 && params.bounds.height() > 0)
+      gtk_window_resize(GTK_WINDOW(widget_), params.bounds.width(),
+                        params.bounds.height());
+    gtk_window_move(GTK_WINDOW(widget_), params.bounds.x(), params.bounds.y());
+  }
+}
+
+NonClientFrameView* NativeWidgetGtk::CreateNonClientFrameView() {
+  return NULL;
+}
+
+void NativeWidgetGtk::UpdateFrameAfterFrameChange() {
+  // We currently don't support different frame types on Gtk, so we don't
+  // need to implement this.
+  NOTIMPLEMENTED();
+}
+
+bool NativeWidgetGtk::ShouldUseNativeFrame() const {
+  return false;
+}
+
+void NativeWidgetGtk::FrameTypeChanged() {
+  // This is called when the Theme has changed, so forward the event to the root
+  // widget.
+  GetWidget()->ThemeChanged();
+  GetWidget()->GetRootView()->SchedulePaint();
+}
+
+Widget* NativeWidgetGtk::GetWidget() {
+  return delegate_->AsWidget();
+}
+
+const Widget* NativeWidgetGtk::GetWidget() const {
+  return delegate_->AsWidget();
+}
+
+gfx::NativeView NativeWidgetGtk::GetNativeView() const {
+  return widget_;
+}
+
+gfx::NativeWindow NativeWidgetGtk::GetNativeWindow() const {
+  return child_ ? NULL : GTK_WINDOW(widget_);
+}
+
+Widget* NativeWidgetGtk::GetTopLevelWidget() {
+  NativeWidgetPrivate* native_widget = GetTopLevelNativeWidget(GetNativeView());
+  return native_widget ? native_widget->GetWidget() : NULL;
+}
+
+const ui::Compositor* NativeWidgetGtk::GetCompositor() const {
+  return compositor_.get();
+}
+
+ui::Compositor* NativeWidgetGtk::GetCompositor() {
+  return compositor_.get();
+}
+
+void NativeWidgetGtk::CalculateOffsetToAncestorWithLayer(
+    gfx::Point* offset,
+    ui::Layer** layer_parent) {
+}
+
+void NativeWidgetGtk::ReorderLayers() {
+}
+
+void NativeWidgetGtk::ViewRemoved(View* view) {
+  if (drop_target_.get())
+    drop_target_->ResetTargetViewIfEquals(view);
+}
+
+void NativeWidgetGtk::SetNativeWindowProperty(const char* name, void* value) {
+  g_object_set_data(G_OBJECT(widget_), name, value);
+}
+
+void* NativeWidgetGtk::GetNativeWindowProperty(const char* name) const {
+  return g_object_get_data(G_OBJECT(widget_), name);
+}
+
+TooltipManager* NativeWidgetGtk::GetTooltipManager() const {
+  return tooltip_manager_.get();
+}
+
+bool NativeWidgetGtk::IsScreenReaderActive() const {
+  return false;
+}
+
+void NativeWidgetGtk::SendNativeAccessibilityEvent(
+    View* view,
+    ui::AccessibilityTypes::Event event_type) {
+  // In the future if we add native GTK accessibility support, the
+  // notification should be sent here.
+}
+
+void NativeWidgetGtk::SetMouseCapture() {
+  DCHECK(!HasMouseCapture());
+
+  // Release the current grab.
+  GtkWidget* current_grab_window = gtk_grab_get_current();
+  if (current_grab_window)
+    gtk_grab_remove(current_grab_window);
+
+  if (is_menu_ && gdk_pointer_is_grabbed())
+    gdk_pointer_ungrab(GDK_CURRENT_TIME);
+
+  // Make sure all app mouse/keyboard events are targeted at us only.
+  gtk_grab_add(window_contents_);
+  if (gtk_grab_get_current() == window_contents_ && !grab_notify_signal_id_) {
+    // "grab_notify" is sent any time the grab changes. We only care about grab
+    // changes when we have done a grab.
+    grab_notify_signal_id_ = g_signal_connect(
+        window_contents_, "grab_notify", G_CALLBACK(&OnGrabNotifyThunk), this);
+  }
+
+  if (is_menu_) {
+    // For menus we do a pointer grab too. This ensures we get mouse events from
+    // other apps. In theory we should do this for all widget types, but doing
+    // so leads to gdk_pointer_grab randomly returning GDK_GRAB_ALREADY_GRABBED.
+    GdkGrabStatus pointer_grab_status =
+        gdk_pointer_grab(window_contents()->window, FALSE,
+                         static_cast<GdkEventMask>(
+                             GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
+                             GDK_POINTER_MOTION_MASK),
+                         NULL, NULL, GDK_CURRENT_TIME);
+    // NOTE: technically grab may fail. We may want to try and continue on in
+    // that case.
+    DCHECK_EQ(GDK_GRAB_SUCCESS, pointer_grab_status);
+    has_pointer_grab_ = pointer_grab_status == GDK_GRAB_SUCCESS;
+
+#if defined(TOUCH_UI)
+    ::Window window = GDK_WINDOW_XID(window_contents()->window);
+    Display* display = GDK_WINDOW_XDISPLAY(window_contents()->window);
+    bool xi2grab =
+        ui::TouchFactory::GetInstance()->GrabTouchDevices(display, window);
+    // xi2grab should always succeed if has_pointer_grab_ succeeded.
+    DCHECK(xi2grab);
+    has_pointer_grab_ = has_pointer_grab_ && xi2grab;
+#endif
+  }
+}
+
+void NativeWidgetGtk::ReleaseMouseCapture() {
+  bool delegate_lost_capture = HasMouseCapture();
+  if (GTK_WIDGET_HAS_GRAB(window_contents_))
+    gtk_grab_remove(window_contents_);
+  if (grab_notify_signal_id_) {
+    g_signal_handler_disconnect(window_contents_, grab_notify_signal_id_);
+    grab_notify_signal_id_ = 0;
+  }
+  if (has_pointer_grab_) {
+    has_pointer_grab_ = false;
+    gdk_pointer_ungrab(GDK_CURRENT_TIME);
+#if defined(TOUCH_UI)
+    ui::TouchFactory::GetInstance()->UngrabTouchDevices(
+        GDK_WINDOW_XDISPLAY(window_contents()->window));
+#endif
+  }
+  if (delegate_lost_capture)
+    delegate_->OnMouseCaptureLost();
+}
+
+bool NativeWidgetGtk::HasMouseCapture() const {
+  return GTK_WIDGET_HAS_GRAB(window_contents_) || has_pointer_grab_;
+}
+
+InputMethod* NativeWidgetGtk::CreateInputMethod() {
+  // Create input method when pure views is enabled but not on views desktop.
+  // TODO(suzhe): Always enable input method when we start to use
+  // RenderWidgetHostViewViews in normal ChromeOS.
+  if (views::Widget::IsPureViews()) {
+#if defined(HAVE_IBUS)
+    InputMethod* input_method =
+        InputMethodIBus::IsInputMethodIBusEnabled() ?
+        static_cast<InputMethod*>(new InputMethodIBus(this)) :
+        static_cast<InputMethod*>(new InputMethodGtk(this));
+#else
+    InputMethod* input_method = new InputMethodGtk(this);
+#endif
+    input_method->Init(GetWidget());
+    return input_method;
+  }
+  // GTK's textfield will handle IME.
+  return NULL;
+}
+
+void NativeWidgetGtk::CenterWindow(const gfx::Size& size) {
+  gfx::Rect center_rect;
+
+  GtkWindow* parent = gtk_window_get_transient_for(GetNativeWindow());
+  if (parent) {
+    // We have a parent window, center over it.
+    gint parent_x = 0;
+    gint parent_y = 0;
+    gtk_window_get_position(parent, &parent_x, &parent_y);
+    gint parent_w = 0;
+    gint parent_h = 0;
+    gtk_window_get_size(parent, &parent_w, &parent_h);
+    center_rect = gfx::Rect(parent_x, parent_y, parent_w, parent_h);
+  } else {
+    // We have no parent window, center over the screen.
+    center_rect = gfx::Screen::GetMonitorWorkAreaNearestWindow(GetNativeView());
+  }
+  gfx::Rect bounds(center_rect.x() + (center_rect.width() - size.width()) / 2,
+                   center_rect.y() + (center_rect.height() - size.height()) / 2,
+                   size.width(), size.height());
+  GetWidget()->SetBoundsConstrained(bounds);
+}
+
+void NativeWidgetGtk::GetWindowPlacement(
+    gfx::Rect* bounds,
+    ui::WindowShowState* show_state) const {
+  // Do nothing for now. ChromeOS isn't yet saving window placement.
+}
+
+void NativeWidgetGtk::SetWindowTitle(const string16& title) {
+  // We don't have a window title on ChromeOS (right now).
+}
+
+void NativeWidgetGtk::SetWindowIcons(const SkBitmap& window_icon,
+                                     const SkBitmap& app_icon) {
+  // We don't have window icons on ChromeOS.
+}
+
+void NativeWidgetGtk::SetAccessibleName(const string16& name) {
+}
+
+void NativeWidgetGtk::SetAccessibleRole(ui::AccessibilityTypes::Role role) {
+}
+
+void NativeWidgetGtk::SetAccessibleState(ui::AccessibilityTypes::State state) {
+}
+
+void NativeWidgetGtk::BecomeModal() {
+  gtk_window_set_modal(GetNativeWindow(), true);
+}
+
+gfx::Rect NativeWidgetGtk::GetWindowScreenBounds() const {
+  // Client == Window bounds on Gtk.
+  return GetClientAreaScreenBounds();
+}
+
+gfx::Rect NativeWidgetGtk::GetClientAreaScreenBounds() const {
+  // Due to timing we can get a request for bounds after Close().
+  // TODO(beng): Figure out if this is bogus.
+  if (!widget_)
+    return gfx::Rect(size_);
+
+  int x = 0, y = 0, w = 0, h = 0;
+  if (GTK_IS_WINDOW(widget_)) {
+    gtk_window_get_position(GTK_WINDOW(widget_), &x, &y);
+    // NOTE: this doesn't include frame decorations, but it should be good
+    // enough for our uses.
+    gtk_window_get_size(GTK_WINDOW(widget_), &w, &h);
+  } else {
+    GetWidgetPositionOnScreen(widget_, &x, &y);
+    w = widget_->allocation.width;
+    h = widget_->allocation.height;
+  }
+  return gfx::Rect(x, y, w, h);
+}
+
+gfx::Rect NativeWidgetGtk::GetRestoredBounds() const {
+  // We currently don't support tiling, so this doesn't matter.
+  return GetWindowScreenBounds();
+}
+
+void NativeWidgetGtk::SetBounds(const gfx::Rect& bounds) {
+  if (child_) {
+    GtkWidget* parent = gtk_widget_get_parent(widget_);
+    if (GTK_IS_VIEWS_FIXED(parent)) {
+      NativeWidgetGtk* parent_widget = static_cast<NativeWidgetGtk*>(
+          internal::NativeWidgetPrivate::GetNativeWidgetForNativeView(parent));
+      parent_widget->PositionChild(widget_, bounds.x(), bounds.y(),
+                                   bounds.width(), bounds.height());
+    } else {
+      DCHECK(GTK_IS_FIXED(parent))
+          << "Parent of NativeWidgetGtk has to be Fixed or ViewsFixed";
+      // Just request the size if the parent is not NativeWidgetGtk but plain
+      // GtkFixed. NativeWidgetGtk does not know the minimum size so we assume
+      // the caller of the SetBounds knows exactly how big it wants to be.
+      gtk_widget_set_size_request(widget_, bounds.width(), bounds.height());
+      if (parent != null_parent_)
+        gtk_fixed_move(GTK_FIXED(parent), widget_, bounds.x(), bounds.y());
+    }
+  } else {
+    if (GTK_WIDGET_MAPPED(widget_)) {
+      // If the widget is mapped (on screen), we can move and resize with one
+      // call, which avoids two separate window manager steps.
+      gdk_window_move_resize(widget_->window, bounds.x(), bounds.y(),
+                             bounds.width(), bounds.height());
+    }
+
+    // Always call gtk_window_move and gtk_window_resize so that GtkWindow's
+    // geometry info is up-to-date.
+    GtkWindow* gtk_window = GTK_WINDOW(widget_);
+    // TODO: this may need to set an initial size if not showing.
+    // TODO: need to constrain based on screen size.
+    if (!bounds.IsEmpty()) {
+      gtk_window_resize(gtk_window, bounds.width(), bounds.height());
+    }
+    gtk_window_move(gtk_window, bounds.x(), bounds.y());
+  }
+}
+
+void NativeWidgetGtk::SetSize(const gfx::Size& size) {
+  if (child_) {
+    GtkWidget* parent = gtk_widget_get_parent(widget_);
+    if (GTK_IS_VIEWS_FIXED(parent)) {
+      gtk_views_fixed_set_widget_size(widget_, size.width(), size.height());
+    } else {
+      gtk_widget_set_size_request(widget_, size.width(), size.height());
+    }
+  } else {
+    if (GTK_WIDGET_MAPPED(widget_))
+      gdk_window_resize(widget_->window, size.width(), size.height());
+    GtkWindow* gtk_window = GTK_WINDOW(widget_);
+    if (!size.IsEmpty())
+      gtk_window_resize(gtk_window, size.width(), size.height());
+  }
+}
+
+void NativeWidgetGtk::MoveAbove(gfx::NativeView native_view) {
+  ui::StackPopupWindow(GetNativeView(), native_view);
+}
+
+void NativeWidgetGtk::MoveToTop() {
+  DCHECK(GTK_IS_WINDOW(GetNativeView()));
+  gtk_window_present(GTK_WINDOW(GetNativeView()));
+}
+
+void NativeWidgetGtk::SetShape(gfx::NativeRegion region) {
+  if (widget_ && widget_->window) {
+    gdk_window_shape_combine_region(widget_->window, region, 0, 0);
+    gdk_region_destroy(region);
+  }
+}
+
+void NativeWidgetGtk::Close() {
+  if (!widget_)
+    return;  // No need to do anything.
+
+  // Hide first.
+  Hide();
+  if (!close_widget_factory_.HasWeakPtrs()) {
+    // And we delay the close just in case we're on the stack.
+    MessageLoop::current()->PostTask(
+        FROM_HERE,
+        base::Bind(&NativeWidgetGtk::CloseNow,
+                   close_widget_factory_.GetWeakPtr()));
+  }
+}
+
+void NativeWidgetGtk::CloseNow() {
+  if (widget_) {
+    gtk_widget_destroy(widget_);  // Triggers OnDestroy().
+  }
+}
+
+void NativeWidgetGtk::EnableClose(bool enable) {
+  gtk_window_set_deletable(GetNativeWindow(), enable);
+}
+
+void NativeWidgetGtk::Show() {
+  if (widget_) {
+    gtk_widget_show(widget_);
+    if (widget_->window)
+      gdk_window_raise(widget_->window);
+  }
+}
+
+void NativeWidgetGtk::Hide() {
+  if (widget_) {
+    gtk_widget_hide(widget_);
+    if (widget_->window)
+      gdk_window_lower(widget_->window);
+  }
+}
+
+void NativeWidgetGtk::ShowMaximizedWithBounds(
+    const gfx::Rect& restored_bounds) {
+  // TODO: when we add maximization support update this.
+  Show();
+}
+
+void NativeWidgetGtk::ShowWithWindowState(ui::WindowShowState show_state) {
+  // No concept of maximization (yet) on ChromeOS.
+  if (show_state == ui::SHOW_STATE_INACTIVE)
+    gtk_window_set_focus_on_map(GetNativeWindow(), false);
+  gtk_widget_show(GetNativeView());
+}
+
+bool NativeWidgetGtk::IsVisible() const {
+  return GTK_WIDGET_VISIBLE(GetNativeView()) && (GetWidget()->is_top_level() ||
+      GetWidget()->GetTopLevelWidget()->IsVisible());
+}
+
+void NativeWidgetGtk::Activate() {
+  gtk_window_present(GetNativeWindow());
+}
+
+void NativeWidgetGtk::Deactivate() {
+  gdk_window_lower(GTK_WIDGET(GetNativeView())->window);
+}
+
+bool NativeWidgetGtk::IsActive() const {
+  DCHECK(!child_);
+  return is_active_;
+}
+
+void NativeWidgetGtk::SetAlwaysOnTop(bool on_top) {
+  DCHECK(!child_);
+  always_on_top_ = on_top;
+  if (widget_)
+    gtk_window_set_keep_above(GTK_WINDOW(widget_), on_top);
+}
+
+void NativeWidgetGtk::Maximize() {
+#if defined(TOUCH_UI)
+  // There may not be a window manager. So maximize ourselves: move to the
+  // top-left corner and resize to the entire bounds of the screen.
+  gfx::Rect screen = gfx::Screen::GetMonitorAreaNearestWindow(GetNativeView());
+  gtk_window_move(GTK_WINDOW(GetNativeWindow()), screen.x(), screen.y());
+  // TODO(backer): Remove this driver bug workaround once it is fixed.
+  gtk_window_resize(GTK_WINDOW(GetNativeWindow()),
+                    screen.width() - 1, screen.height());
+#else
+  gtk_window_maximize(GetNativeWindow());
+#endif
+}
+
+void NativeWidgetGtk::Minimize() {
+  gtk_window_iconify(GetNativeWindow());
+}
+
+bool NativeWidgetGtk::IsMaximized() const {
+  return window_state_ & GDK_WINDOW_STATE_MAXIMIZED;
+}
+
+bool NativeWidgetGtk::IsMinimized() const {
+  return window_state_ & GDK_WINDOW_STATE_ICONIFIED;
+}
+
+void NativeWidgetGtk::Restore() {
+  if (IsFullscreen()) {
+    SetFullscreen(false);
+  } else {
+    if (IsMaximized())
+      gtk_window_unmaximize(GetNativeWindow());
+    else if (IsMinimized())
+      gtk_window_deiconify(GetNativeWindow());
+  }
+}
+
+void NativeWidgetGtk::SetFullscreen(bool fullscreen) {
+  if (fullscreen)
+    gtk_window_fullscreen(GetNativeWindow());
+  else
+    gtk_window_unfullscreen(GetNativeWindow());
+}
+
+bool NativeWidgetGtk::IsFullscreen() const {
+  return window_state_ & GDK_WINDOW_STATE_FULLSCREEN;
+}
+
+void NativeWidgetGtk::SetOpacity(unsigned char opacity) {
+  opacity_ = opacity;
+  if (widget_) {
+    // We can only set the opacity when the widget has been realized.
+    gdk_window_set_opacity(widget_->window, static_cast<gdouble>(opacity) /
+        static_cast<gdouble>(255));
+  }
+}
+
+void NativeWidgetGtk::SetUseDragFrame(bool use_drag_frame) {
+  NOTIMPLEMENTED();
+}
+
+bool NativeWidgetGtk::IsAccessibleWidget() const {
+  return false;
+}
+
+void NativeWidgetGtk::RunShellDrag(View* view,
+                                   const ui::OSExchangeData& data,
+                                   int operation) {
+  DoDrag(data, operation);
+}
+
+void NativeWidgetGtk::SchedulePaintInRect(const gfx::Rect& rect) {
+  // No need to schedule paint if
+  // 1) widget_ is NULL. This may happen because this instance may
+  // be deleted after the gtk widget has been destroyed (See OnDestroy()).
+  // 2) widget_ is not drawable (mapped and visible)
+  // 3) If it's never painted before. The first expose event will
+  // paint the area that has to be painted.
+  if (widget_ && GTK_WIDGET_DRAWABLE(widget_) && painted_) {
+    gtk_widget_queue_draw_area(widget_, rect.x(), rect.y(), rect.width(),
+                               rect.height());
+  }
+}
+
+void NativeWidgetGtk::SetCursor(gfx::NativeCursor cursor) {
+#if defined(TOUCH_UI)
+  if (!ui::TouchFactory::GetInstance()->is_cursor_visible())
+    cursor = gfx::GetCursor(GDK_BLANK_CURSOR);
+#endif
+  // |window_contents_| is placed on top of |widget_|. So the cursor needs to be
+  // set on |window_contents_| instead of |widget_|.
+  if (window_contents_)
+    gdk_window_set_cursor(window_contents_->window, cursor);
+}
+
+void NativeWidgetGtk::ClearNativeFocus() {
+  DCHECK(!child_);
+  if (!GetNativeView()) {
+    NOTREACHED();
+    return;
+  }
+  gtk_window_set_focus(GTK_WINDOW(GetNativeView()), NULL);
+}
+
+void NativeWidgetGtk::FocusNativeView(gfx::NativeView native_view) {
+  if (native_view && !gtk_widget_is_focus(native_view))
+    gtk_widget_grab_focus(native_view);
+}
+
+bool NativeWidgetGtk::ConvertPointFromAncestor(
+    const Widget* ancestor, gfx::Point* point) const {
+  NOTREACHED();
+  return false;
+}
+
+gfx::Rect NativeWidgetGtk::GetWorkAreaBoundsInScreen() const {
+  return gfx::Screen::GetMonitorWorkAreaNearestWindow(GetNativeView());
+}
+
+void NativeWidgetGtk::SetInactiveRenderingDisabled(bool value) {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetGtk, protected:
+
+void NativeWidgetGtk::OnSizeRequest(GtkWidget* widget,
+                                    GtkRequisition* requisition) {
+  // Do only return the preferred size for child windows. GtkWindow interprets
+  // the requisition as a minimum size for top level windows, returning a
+  // preferred size for these would prevents us from setting smaller window
+  // sizes.
+  if (child_) {
+    gfx::Size size(GetWidget()->GetRootView()->GetPreferredSize());
+    requisition->width = size.width();
+    requisition->height = size.height();
+  }
+}
+
+void NativeWidgetGtk::OnSizeAllocate(GtkWidget* widget,
+                                     GtkAllocation* allocation) {
+  // See comment next to size_ as to why we do this. Also note, it's tempting
+  // to put this in the static method so subclasses don't need to worry about
+  // it, but if a subclasses needs to set a shape then they need to always
+  // reset the shape in this method regardless of whether the size changed.
+  gfx::Size new_size(allocation->width, allocation->height);
+  if (new_size == size_)
+    return;
+  size_ = new_size;
+  if (compositor_.get())
+    compositor_->WidgetSizeChanged(size_);
+  delegate_->OnNativeWidgetSizeChanged(size_);
+
+  if (GetWidget()->non_client_view()) {
+    // The Window's NonClientView may provide a custom shape for the Window.
+    gfx::Path window_mask;
+    GetWidget()->non_client_view()->GetWindowMask(gfx::Size(allocation->width,
+                                                            allocation->height),
+                                                  &window_mask);
+    GdkRegion* mask_region = window_mask.CreateNativeRegion();
+    gdk_window_shape_combine_region(GetNativeView()->window, mask_region, 0, 0);
+    if (mask_region)
+      gdk_region_destroy(mask_region);
+
+    SaveWindowPosition();
+  }
+}
+
+gboolean NativeWidgetGtk::OnPaint(GtkWidget* widget, GdkEventExpose* event) {
+  gdk_window_set_debug_updates(Widget::IsDebugPaintEnabled());
+
+  if (transparent_ && child_) {
+    // Clear the background before drawing any view and native components.
+    DrawTransparentBackground(widget, event);
+    if (!CompositePainter::IsComposited(widget_) &&
+        gdk_screen_is_composited(gdk_screen_get_default())) {
+      // Let the parent draw the content only after something is drawn on
+      // the widget.
+      CompositePainter::SetComposited(widget_);
+    }
+  }
+
+  ui::ScopedRegion region(gdk_region_copy(event->region));
+  if (!gdk_region_empty(region.Get())) {
+    GdkRectangle clip_bounds;
+    gdk_region_get_clipbox(region.Get(), &clip_bounds);
+    if (!delegate_->OnNativeWidgetPaintAccelerated(gfx::Rect(clip_bounds))) {
+      gfx::CanvasSkiaPaint canvas(event);
+      if (!canvas.is_empty()) {
+        canvas.set_composite_alpha(is_transparent());
+        delegate_->OnNativeWidgetPaint(&canvas);
+      }
+    }
+  }
+
+  if (!painted_) {
+    painted_ = true;
+    if (!child_)
+      UpdateFreezeUpdatesProperty(GTK_WINDOW(widget_), false /* remove */);
+  }
+  return false;  // False indicates other widgets should get the event as well.
+}
+
+void NativeWidgetGtk::OnDragDataGet(GtkWidget* widget,
+                                    GdkDragContext* context,
+                                    GtkSelectionData* data,
+                                    guint info,
+                                    guint time) {
+  if (!drag_data_) {
+    NOTREACHED();
+    return;
+  }
+  drag_data_->WriteFormatToSelection(info, data);
+}
+
+void NativeWidgetGtk::OnDragDataReceived(GtkWidget* widget,
+                                         GdkDragContext* context,
+                                         gint x,
+                                         gint y,
+                                         GtkSelectionData* data,
+                                         guint info,
+                                         guint time) {
+  if (drop_target_.get())
+    drop_target_->OnDragDataReceived(context, x, y, data, info, time);
+}
+
+gboolean NativeWidgetGtk::OnDragDrop(GtkWidget* widget,
+                                     GdkDragContext* context,
+                                     gint x,
+                                     gint y,
+                                     guint time) {
+  if (drop_target_.get()) {
+    return drop_target_->OnDragDrop(context, x, y, time);
+  }
+  return FALSE;
+}
+
+void NativeWidgetGtk::OnDragEnd(GtkWidget* widget, GdkDragContext* context) {
+  if (!drag_data_) {
+    // This indicates we didn't start a drag operation, and should never
+    // happen.
+    NOTREACHED();
+    return;
+  }
+  // Quit the nested message loop we spawned in DoDrag.
+  MessageLoop::current()->Quit();
+}
+
+gboolean NativeWidgetGtk::OnDragFailed(GtkWidget* widget,
+                                       GdkDragContext* context,
+                                       GtkDragResult result) {
+  return FALSE;
+}
+
+void NativeWidgetGtk::OnDragLeave(GtkWidget* widget,
+                                  GdkDragContext* context,
+                                  guint time) {
+  if (ignore_drag_leave_) {
+    ignore_drag_leave_ = false;
+    return;
+  }
+  if (drop_target_.get()) {
+    drop_target_->OnDragLeave(context, time);
+    drop_target_.reset(NULL);
+  }
+}
+
+gboolean NativeWidgetGtk::OnDragMotion(GtkWidget* widget,
+                                       GdkDragContext* context,
+                                       gint x,
+                                       gint y,
+                                       guint time) {
+  if (!drop_target_.get()) {
+    drop_target_.reset(new DropTargetGtk(
+        reinterpret_cast<internal::RootView*>(GetWidget()->GetRootView()),
+        context));
+  }
+  return drop_target_->OnDragMotion(context, x, y, time);
+}
+
+gboolean NativeWidgetGtk::OnEnterNotify(GtkWidget* widget,
+                                        GdkEventCrossing* event) {
+  if (HasMouseCapture() && event->mode == GDK_CROSSING_GRAB) {
+    // Doing a grab results an async enter event, regardless of where the mouse
+    // is. We don't want to generate a mouse move in this case.
+    return false;
+  }
+
+  if (!GetWidget()->last_mouse_event_was_move_ &&
+      !GetWidget()->is_mouse_button_pressed_) {
+    // When a mouse button is pressed gtk generates a leave, enter, press.
+    // RootView expects to get a mouse move before a press, otherwise enter is
+    // not set. So we generate a move here.
+    GdkEventMotion motion = { GDK_MOTION_NOTIFY, event->window,
+        event->send_event, event->time, event->x, event->y, NULL, event->state,
+        0, NULL, event->x_root, event->y_root };
+
+    // If this event is the result of pressing a button then one of the button
+    // modifiers is set. Unset it as we're compensating for the leave generated
+    // when you press a button.
+    motion.state &= ~(GDK_BUTTON1_MASK | GDK_BUTTON2_MASK | GDK_BUTTON3_MASK);
+
+    MouseEvent mouse_event(TransformEvent(&motion));
+    delegate_->OnMouseEvent(mouse_event);
+  }
+  return false;
+}
+
+gboolean NativeWidgetGtk::OnLeaveNotify(GtkWidget* widget,
+                                        GdkEventCrossing* event) {
+  gdk_window_set_cursor(widget->window, gfx::GetCursor(GDK_LEFT_PTR));
+
+  GetWidget()->ResetLastMouseMoveFlag();
+
+  if (!HasMouseCapture() && !GetWidget()->is_mouse_button_pressed_) {
+    // Don't convert if the event is synthetic and has 0x0 coordinates.
+    if (event->x_root || event->y_root || event->x || event->y ||
+        !event->send_event) {
+      TransformEvent(event);
+    }
+    MouseEvent mouse_event(reinterpret_cast<GdkEvent*>(event));
+    delegate_->OnMouseEvent(mouse_event);
+  }
+  return false;
+}
+
+gboolean NativeWidgetGtk::OnMotionNotify(GtkWidget* widget,
+                                         GdkEventMotion* event) {
+  if (GetWidget()->non_client_view()) {
+    GdkEventMotion transformed_event = *event;
+    TransformEvent(&transformed_event);
+    gfx::Point translated_location(transformed_event.x, transformed_event.y);
+
+    // Update the cursor for the screen edge.
+    int hittest_code =
+        GetWidget()->non_client_view()->NonClientHitTest(translated_location);
+    if (hittest_code != HTCLIENT) {
+      GdkCursorType cursor_type = HitTestCodeToGdkCursorType(hittest_code);
+      gdk_window_set_cursor(widget->window, gfx::GetCursor(cursor_type));
+    }
+  }
+
+  MouseEvent mouse_event(TransformEvent(event));
+  delegate_->OnMouseEvent(mouse_event);
+  return true;
+}
+
+gboolean NativeWidgetGtk::OnButtonPress(GtkWidget* widget,
+                                        GdkEventButton* event) {
+  if (GetWidget()->non_client_view()) {
+    GdkEventButton transformed_event = *event;
+    MouseEvent mouse_event(TransformEvent(&transformed_event));
+
+    int hittest_code = GetWidget()->non_client_view()->NonClientHitTest(
+        mouse_event.location());
+    switch (hittest_code) {
+      case HTCAPTION: {
+        // Start dragging if the mouse event is a single click and *not* a right
+        // click. If it is a right click, then pass it through to
+        // NativeWidgetGtk::OnButtonPress so that View class can show
+        // ContextMenu upon a mouse release event. We only start drag on single
+        // clicks as we get a crash in Gtk on double/triple clicks.
+        if (event->type == GDK_BUTTON_PRESS &&
+            !mouse_event.IsOnlyRightMouseButton()) {
+          gfx::Point screen_point(event->x, event->y);
+          View::ConvertPointToScreen(GetWidget()->GetRootView(), &screen_point);
+          gtk_window_begin_move_drag(GetNativeWindow(), event->button,
+                                     screen_point.x(), screen_point.y(),
+                                     event->time);
+          return TRUE;
+        }
+        break;
+      }
+      case HTBOTTOM:
+      case HTBOTTOMLEFT:
+      case HTBOTTOMRIGHT:
+      case HTGROWBOX:
+      case HTLEFT:
+      case HTRIGHT:
+      case HTTOP:
+      case HTTOPLEFT:
+      case HTTOPRIGHT: {
+        gfx::Point screen_point(event->x, event->y);
+        View::ConvertPointToScreen(GetWidget()->GetRootView(), &screen_point);
+        // TODO(beng): figure out how to get a good minimum size.
+        gtk_widget_set_size_request(GetNativeView(), 100, 100);
+        gtk_window_begin_resize_drag(GetNativeWindow(),
+                                     HitTestCodeToGDKWindowEdge(hittest_code),
+                                     event->button, screen_point.x(),
+                                     screen_point.y(), event->time);
+        return TRUE;
+      }
+      default:
+        // Everything else falls into standard client event handling...
+        break;
+    }
+  }
+
+  if (event->type == GDK_2BUTTON_PRESS || event->type == GDK_3BUTTON_PRESS) {
+    // The sequence for double clicks is press, release, press, 2press, release.
+    // This means that at the time we get the second 'press' we don't know
+    // whether it corresponds to a double click or not. For now we're completely
+    // ignoring the 2press/3press events as they are duplicate. To make this
+    // work right we need to write our own code that detects if the press is a
+    // double/triple. For now we're completely punting, which means we always
+    // get single clicks.
+    // TODO: fix this.
+    return true;
+  }
+
+  MouseEvent mouse_event(TransformEvent(event));
+  // Returns true to consume the event when widget is not transparent.
+  return delegate_->OnMouseEvent(mouse_event) || !transparent_;
+}
+
+gboolean NativeWidgetGtk::OnButtonRelease(GtkWidget* widget,
+                                          GdkEventButton* event) {
+  // GTK generates a mouse release at the end of dnd. We need to ignore it.
+  if (!drag_data_) {
+    MouseEvent mouse_event(TransformEvent(event));
+    delegate_->OnMouseEvent(mouse_event);
+  }
+  return true;
+}
+
+gboolean NativeWidgetGtk::OnScroll(GtkWidget* widget, GdkEventScroll* event) {
+  MouseWheelEvent mouse_event(TransformEvent(event));
+  return delegate_->OnMouseEvent(mouse_event);
+}
+
+gboolean NativeWidgetGtk::OnFocusIn(GtkWidget* widget, GdkEventFocus* event) {
+  if (has_focus_)
+    return false;  // This is the second focus-in event in a row, ignore it.
+  has_focus_ = true;
+
+  should_handle_menu_key_release_ = false;
+
+  if (!GetWidget()->is_top_level())
+    return false;
+
+  // Only top-level Widget should have an InputMethod instance.
+  InputMethod* input_method = GetWidget()->GetInputMethod();
+  if (input_method)
+    input_method->OnFocus();
+
+  // See description of got_initial_focus_in_ for details on this.
+  if (!got_initial_focus_in_) {
+    got_initial_focus_in_ = true;
+    // Sets initial focus here. On X11/Gtk, window creation
+    // is asynchronous and a focus request has to be made after a window
+    // gets created.
+    GetWidget()->SetInitialFocus();
+  }
+  return false;
+}
+
+gboolean NativeWidgetGtk::OnFocusOut(GtkWidget* widget, GdkEventFocus* event) {
+  if (!has_focus_)
+    return false;  // This is the second focus-out event in a row, ignore it.
+  has_focus_ = false;
+
+  if (!GetWidget()->is_top_level())
+    return false;
+
+  // Only top-level Widget should have an InputMethod instance.
+  InputMethod* input_method = GetWidget()->GetInputMethod();
+  if (input_method)
+    input_method->OnBlur();
+  return false;
+}
+
+gboolean NativeWidgetGtk::OnEventKey(GtkWidget* widget, GdkEventKey* event) {
+  KeyEvent key(reinterpret_cast<GdkEvent*>(event));
+  InputMethod* input_method = GetWidget()->GetInputMethod();
+  if (input_method)
+    input_method->DispatchKeyEvent(key);
+  else
+    DispatchKeyEventPostIME(key);
+
+  // Returns true to prevent GtkWindow's default key event handler.
+  return true;
+}
+
+gboolean NativeWidgetGtk::OnQueryTooltip(GtkWidget* widget,
+                                         gint x,
+                                         gint y,
+                                         gboolean keyboard_mode,
+                                         GtkTooltip* tooltip) {
+#if defined(TOUCH_UI)
+  return false; // Tell GTK not to draw tooltips as we draw tooltips in views
+#else
+  return static_cast<TooltipManagerGtk*>(tooltip_manager_.get())->
+      ShowTooltip(x, y, keyboard_mode, tooltip);
+#endif
+}
+
+gboolean NativeWidgetGtk::OnVisibilityNotify(GtkWidget* widget,
+                                             GdkEventVisibility* event) {
+  return false;
+}
+
+gboolean NativeWidgetGtk::OnGrabBrokeEvent(GtkWidget* widget, GdkEvent* event) {
+  if (!has_pointer_grab_ && !has_keyboard_grab_) {
+    // We don't have any grabs; don't attempt to do anything.
+    return false;
+  }
+
+  // Sent when either the keyboard or pointer grab is broke. We drop both grabs
+  // in this case.
+  if (event->grab_broken.keyboard) {
+    // Keyboard grab was broke.
+    has_keyboard_grab_ = false;
+    if (has_pointer_grab_) {
+      has_pointer_grab_ = false;
+      gdk_pointer_ungrab(GDK_CURRENT_TIME);
+      delegate_->OnMouseCaptureLost();
+    }
+  } else {
+    // Mouse grab was broke.
+    has_pointer_grab_ = false;
+    if (has_keyboard_grab_) {
+      has_keyboard_grab_ = false;
+      gdk_keyboard_ungrab(GDK_CURRENT_TIME);
+    }
+    delegate_->OnMouseCaptureLost();
+  }
+  ReleaseMouseCapture();
+
+#if defined(TOUCH_UI)
+  ui::TouchFactory::GetInstance()->UngrabTouchDevices(
+      GDK_WINDOW_XDISPLAY(window_contents()->window));
+#endif
+  return false;  // To let other widgets get the event.
+}
+
+void NativeWidgetGtk::OnGrabNotify(GtkWidget* widget, gboolean was_grabbed) {
+  // Sent when gtk_grab_add changes.
+  if (!window_contents_)
+    return;  // Grab broke after window destroyed, don't try processing it.
+  if (!was_grabbed)  // Indicates we've been shadowed (lost grab).
+    HandleGtkGrabBroke();
+}
+
+void NativeWidgetGtk::OnDestroy(GtkWidget* object) {
+  signal_registrar_.reset();
+  if (grab_notify_signal_id_) {
+    g_signal_handler_disconnect(window_contents_, grab_notify_signal_id_);
+    grab_notify_signal_id_ = 0;
+  }
+  delegate_->OnNativeWidgetDestroying();
+  if (!child_)
+    ActiveWindowWatcherX::RemoveObserver(this);
+  // Note that this handler is hooked to GtkObject::destroy.
+  // NULL out pointers here since we might still be in an observer list
+  // until deletion happens.
+  widget_ = window_contents_ = NULL;
+}
+
+void NativeWidgetGtk::OnDestroyed(GObject *where_the_object_was) {
+  delegate_->OnNativeWidgetDestroyed();
+  if (ownership_ == Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET)
+    delete this;
+}
+
+void NativeWidgetGtk::OnShow(GtkWidget* widget) {
+  delegate_->OnNativeWidgetVisibilityChanged(true);
+}
+
+void NativeWidgetGtk::OnMap(GtkWidget* widget) {
+#if defined(TOUCH_UI)
+  // Force an expose event to trigger OnPaint for touch. This is
+  // a workaround for a bug that X Expose event does not trigger
+  // Gdk's expose signal. This happens when you try to open views menu
+  // while a virtual keyboard gets kicked in or out. This seems to be
+  // a bug in message_pump_x.cc as we do get X Expose event but
+  // it doesn't trigger gtk's expose signal. We're not going to fix this
+  // as we're removing gtk and migrating to new compositor.
+  gdk_window_process_all_updates();
+#endif
+}
+
+void NativeWidgetGtk::OnHide(GtkWidget* widget) {
+  delegate_->OnNativeWidgetVisibilityChanged(false);
+}
+
+gboolean NativeWidgetGtk::OnWindowStateEvent(GtkWidget* widget,
+                                             GdkEventWindowState* event) {
+  if (GetWidget()->non_client_view() &&
+      !(event->new_window_state & GDK_WINDOW_STATE_WITHDRAWN)) {
+    SaveWindowPosition();
+  }
+  window_state_ = event->new_window_state;
+  return FALSE;
+}
+
+gboolean NativeWidgetGtk::OnConfigureEvent(GtkWidget* widget,
+                                           GdkEventConfigure* event) {
+  SaveWindowPosition();
+  return FALSE;
+}
+
+void NativeWidgetGtk::HandleGtkGrabBroke() {
+  ReleaseMouseCapture();
+  delegate_->OnMouseCaptureLost();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetGtk, private:
+
+void NativeWidgetGtk::ScheduleDraw() {
+  SchedulePaintInRect(gfx::Rect(gfx::Point(), size_));
+}
+
+void NativeWidgetGtk::DispatchKeyEventPostIME(const KeyEvent& key) {
+  // Always reset |should_handle_menu_key_release_| unless we are handling a
+  // VKEY_MENU key release event. It ensures that VKEY_MENU accelerator can only
+  // be activated when handling a VKEY_MENU key release event which is preceded
+  // by an unhandled VKEY_MENU key press event. See also HandleKeyboardEvent().
+  if (key.key_code() != ui::VKEY_MENU || key.type() != ui::ET_KEY_RELEASED)
+    should_handle_menu_key_release_ = false;
+
+  // Send the key event to View hierarchy first.
+  bool handled = delegate_->OnKeyEvent(key);
+
+  if (key.key_code() == ui::VKEY_PROCESSKEY || handled)
+    return;
+
+  // Dispatch the key event to native GtkWidget hierarchy.
+  // To prevent GtkWindow from handling the key event as a keybinding, we need
+  // to bypass GtkWindow's default key event handler and dispatch the event
+  // here.
+  GdkEventKey* event = reinterpret_cast<GdkEventKey*>(key.gdk_event());
+  if (!handled && event && GTK_IS_WINDOW(widget_))
+    handled = gtk_window_propagate_key_event(GTK_WINDOW(widget_), event);
+
+  // On Linux, in order to handle VKEY_MENU (Alt) accelerator key correctly and
+  // avoid issues like: http://crbug.com/40966 and http://crbug.com/49701, we
+  // should only send the key event to the focus manager if it's not handled by
+  // any View or native GtkWidget.
+  // The flow is different when the focus is in a RenderWidgetHostViewGtk, which
+  // always consumes the key event and send it back to us later by calling
+  // HandleKeyboardEvent() directly, if it's not handled by webkit.
+  if (!handled)
+    handled = HandleKeyboardEvent(key);
+
+  // Dispatch the key event for bindings processing.
+  if (!handled && event && GTK_IS_WINDOW(widget_))
+    gtk_bindings_activate_event(GTK_OBJECT(widget_), event);
+}
+
+void NativeWidgetGtk::SetInitParams(const Widget::InitParams& params) {
+  DCHECK(!GetNativeView());
+
+  ownership_ = params.ownership;
+  child_ = params.child;
+  is_menu_ = params.type == Widget::InitParams::TYPE_MENU;
+
+  // TODO(beng): The secondary checks here actually obviate the need for
+  //             params.transient but that's only because NativeWidgetGtk
+  //             considers any top-level widget to be a transient widget. We
+  //             will probably want to ammend this assumption at some point.
+  if (params.transient || params.parent || params.parent_widget)
+    transient_to_parent_  = true;
+  if (params.transparent)
+    MakeTransparent();
+  if (!params.accept_events && !child_)
+    ignore_events_ = true;
+  if (params.double_buffer)
+    EnableDoubleBuffer(true);
+}
+
+gboolean NativeWidgetGtk::OnWindowPaint(GtkWidget* widget,
+                                        GdkEventExpose* event) {
+  // Clear the background to be totally transparent. We don't need to
+  // paint the root view here as that is done by OnPaint.
+  DCHECK(transparent_);
+  DrawTransparentBackground(widget, event);
+  // The Keyboard layout view has a renderer that covers the entire
+  // window, which prevents OnPaint from being called on window_contents_,
+  // so we need to remove the FREEZE_UPDATES property here.
+  if (!painted_) {
+    painted_ = true;
+    UpdateFreezeUpdatesProperty(GTK_WINDOW(widget_), false /* remove */);
+  }
+  return false;
+}
+
+void NativeWidgetGtk::OnChildExpose(GtkWidget* child) {
+  DCHECK(!child_);
+  if (!painted_) {
+    painted_ = true;
+    UpdateFreezeUpdatesProperty(GTK_WINDOW(widget_), false /* remove */);
+  }
+  RemoveExposeHandlerIfExists(child);
+}
+
+// static
+gboolean NativeWidgetGtk::ChildExposeHandler(GtkWidget* widget,
+                                             GdkEventExpose* event) {
+  GtkWidget* toplevel = gtk_widget_get_ancestor(widget, GTK_TYPE_WINDOW);
+  CHECK(toplevel);
+  Widget* views_widget = Widget::GetWidgetForNativeView(toplevel);
+  CHECK(views_widget);
+  NativeWidgetGtk* widget_gtk =
+      static_cast<NativeWidgetGtk*>(views_widget->native_widget());
+  widget_gtk->OnChildExpose(widget);
+  return false;
+}
+
+void NativeWidgetGtk::CreateGtkWidget(const Widget::InitParams& params) {
+  // We turn off double buffering for two reasons:
+  // 1. We draw to a canvas then composite to the screen, which means we're
+  //    doing our own double buffering already.
+  // 2. GTKs double buffering clips to the dirty region. RootView occasionally
+  //    needs to expand the paint region (see RootView::OnPaint). This means
+  //    that if we use GTK's double buffering and we tried to expand the dirty
+  //    region, it wouldn't get painted.
+  if (child_) {
+    window_contents_ = widget_ = gtk_views_fixed_new();
+    gtk_widget_set_name(widget_, "views-gtkwidget-child-fixed");
+    if (!is_double_buffered_)
+      GTK_WIDGET_UNSET_FLAGS(widget_, GTK_DOUBLE_BUFFERED);
+    gtk_fixed_set_has_window(GTK_FIXED(widget_), true);
+    if (!params.parent && !null_parent_) {
+      GtkWidget* popup = gtk_window_new(GTK_WINDOW_POPUP);
+      null_parent_ = gtk_fixed_new();
+      gtk_widget_set_name(null_parent_, "views-gtkwidget-null-parent");
+      gtk_container_add(GTK_CONTAINER(popup), null_parent_);
+      gtk_widget_realize(null_parent_);
+    }
+    if (transparent_) {
+      // transparency has to be configured before widget is realized.
+      DCHECK(params.parent) <<
+          "Transparent widget must have parent when initialized";
+      ConfigureWidgetForTransparentBackground(params.parent);
+    }
+    gtk_container_add(
+        GTK_CONTAINER(params.parent ? params.parent : null_parent_), widget_);
+    gtk_widget_realize(widget_);
+    if (transparent_) {
+      // The widget has to be realized to set composited flag.
+      // I tried "realize" signal to set this flag, but it did not work
+      // when the top level is popup.
+      DCHECK(GTK_WIDGET_REALIZED(widget_));
+      gdk_window_set_composited(widget_->window, true);
+    }
+    if (params.parent && !params.bounds.size().IsEmpty()) {
+      // Make sure that an widget is given it's initial size before
+      // we're done initializing, to take care of some potential
+      // corner cases when programmatically arranging hierarchies as
+      // seen in
+      // http://code.google.com/p/chromium-os/issues/detail?id=5987
+
+      // This can't be done without a parent present, or stale data
+      // might show up on the screen as seen in
+      // http://code.google.com/p/chromium/issues/detail?id=53870
+      GtkAllocation alloc =
+          { 0, 0, params.bounds.width(), params.bounds.height() };
+      gtk_widget_size_allocate(widget_, &alloc);
+    }
+    if (params.type == Widget::InitParams::TYPE_CONTROL) {
+      // Controls are initially visible.
+      gtk_widget_show(widget_);
+    }
+  } else {
+    Widget::InitParams::Type type = params.type;
+    if (type == Widget::InitParams::TYPE_BUBBLE &&
+        params.delegate->AsBubbleDelegate() &&
+        params.delegate->AsBubbleDelegate()->use_focusless()) {
+      // Handles focusless bubble type, which are bubbles that should
+      // act like popups rather than gtk windows. They do not get focus
+      // and are not controlled by window manager placement.
+      type = Widget::InitParams::TYPE_POPUP;
+    }
+
+    // Use our own window class to override GtkWindow's move_focus method.
+    widget_ = gtk_views_window_new(WindowTypeToGtkWindowType(type));
+    gtk_widget_set_name(widget_, "views-gtkwidget-window");
+    if (transient_to_parent_) {
+      gtk_window_set_transient_for(GTK_WINDOW(widget_),
+                                   GTK_WINDOW(params.parent));
+    }
+    GTK_WIDGET_UNSET_FLAGS(widget_, GTK_DOUBLE_BUFFERED);
+
+    // Gtk determines the size for windows based on the requested size of the
+    // child. For NativeWidgetGtk the child is a fixed. If the fixed ends up
+    // with a child widget it's possible the child widget will drive the
+    // requested size of the widget, which we don't want. We explicitly set a
+    // value of 1x1 here so that gtk doesn't attempt to resize the window if we
+    // end up with a situation where the requested size of a child of the fixed
+    // is greater than the size of the window. By setting the size in this
+    // manner we're also allowing users of WidgetGtk to change the requested
+    // size at any time.
+    gtk_widget_set_size_request(widget_, 1, 1);
+
+    if (!params.bounds.size().IsEmpty()) {
+      // When we realize the window, the window manager is given a size. If we
+      // don't specify a size before then GTK defaults to 200x200. Specify
+      // a size now so that the window manager sees the requested size.
+      GtkAllocation alloc =
+          { 0, 0, params.bounds.width(), params.bounds.height() };
+      gtk_widget_size_allocate(widget_, &alloc);
+    }
+    gtk_window_set_decorated(GTK_WINDOW(widget_), false);
+    // We'll take care of positioning our window.
+    gtk_window_set_position(GTK_WINDOW(widget_), GTK_WIN_POS_NONE);
+
+    window_contents_ = gtk_views_fixed_new();
+    gtk_widget_set_name(window_contents_, "views-gtkwidget-window-fixed");
+    if (!is_double_buffered_)
+      GTK_WIDGET_UNSET_FLAGS(window_contents_, GTK_DOUBLE_BUFFERED);
+    gtk_fixed_set_has_window(GTK_FIXED(window_contents_), true);
+    gtk_container_add(GTK_CONTAINER(widget_), window_contents_);
+    gtk_widget_show(window_contents_);
+    g_object_set_data(G_OBJECT(window_contents_), kNativeWidgetKey,
+                       static_cast<NativeWidgetGtk*>(this));
+    if (transparent_)
+      ConfigureWidgetForTransparentBackground(NULL);
+
+    if (ignore_events_)
+      ConfigureWidgetForIgnoreEvents();
+
+    // Realize the window_contents_ so that we can always get a handle for
+    // acceleration. Without this we need to check every time paint is
+    // invoked.
+    gtk_widget_realize(window_contents_);
+
+    SetAlwaysOnTop(always_on_top_);
+    // UpdateFreezeUpdatesProperty will realize the widget and handlers like
+    // size-allocate will function properly.
+    UpdateFreezeUpdatesProperty(GTK_WINDOW(widget_), true /* add */);
+  }
+  SetNativeWindowProperty(kNativeWidgetKey, this);
+}
+
+void NativeWidgetGtk::ConfigureWidgetForTransparentBackground(
+    GtkWidget* parent) {
+  DCHECK(widget_ && window_contents_);
+
+  GdkColormap* rgba_colormap =
+      gdk_screen_get_rgba_colormap(gtk_widget_get_screen(widget_));
+  if (!rgba_colormap) {
+    transparent_ = false;
+    return;
+  }
+  // To make the background transparent we need to install the RGBA colormap
+  // on both the window and fixed. In addition we need to make sure no
+  // decorations are drawn. The last bit is to make sure the widget doesn't
+  // attempt to draw a pixmap in it's background.
+  if (!child_) {
+    DCHECK(parent == NULL);
+    gtk_widget_set_colormap(widget_, rgba_colormap);
+    gtk_widget_set_app_paintable(widget_, true);
+    signal_registrar_->Connect(widget_, "expose_event",
+                               G_CALLBACK(&OnWindowPaintThunk), this);
+    gtk_widget_realize(widget_);
+    gdk_window_set_decorations(widget_->window,
+                               static_cast<GdkWMDecoration>(0));
+  } else {
+    DCHECK(parent);
+    CompositePainter::AddCompositePainter(parent);
+  }
+  DCHECK(!GTK_WIDGET_REALIZED(window_contents_));
+  gtk_widget_set_colormap(window_contents_, rgba_colormap);
+}
+
+void NativeWidgetGtk::ConfigureWidgetForIgnoreEvents() {
+  gtk_widget_realize(widget_);
+  GdkWindow* gdk_window = widget_->window;
+  Display* display = GDK_WINDOW_XDISPLAY(gdk_window);
+  XID win = GDK_WINDOW_XID(gdk_window);
+
+  // This sets the clickable area to be empty, allowing all events to be
+  // passed to any windows behind this one.
+  XShapeCombineRectangles(
+      display,
+      win,
+      ShapeInput,
+      0,  // x offset
+      0,  // y offset
+      NULL,  // rectangles
+      0,  // num rectangles
+      ShapeSet,
+      0);
+}
+
+void NativeWidgetGtk::DrawTransparentBackground(GtkWidget* widget,
+                                                GdkEventExpose* event) {
+  cairo_t* cr = gdk_cairo_create(widget->window);
+  cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
+  gdk_cairo_region(cr, event->region);
+  cairo_fill(cr);
+  cairo_destroy(cr);
+}
+
+void NativeWidgetGtk::SaveWindowPosition() {
+  // The delegate may have gone away on us.
+  if (!GetWidget()->widget_delegate())
+    return;
+
+  ui::WindowShowState show_state = ui::SHOW_STATE_NORMAL;
+  if (IsMaximized())
+    show_state = ui::SHOW_STATE_MAXIMIZED;
+  else if (IsMinimized())
+    show_state = ui::SHOW_STATE_MINIMIZED;
+  GetWidget()->widget_delegate()->SaveWindowPlacement(
+      GetWidget()->GetWindowScreenBounds(),
+      show_state);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Widget, public:
+
+// static
+void Widget::NotifyLocaleChanged() {
+  GList *window_list = gtk_window_list_toplevels();
+  for (GList* element = window_list; element; element = g_list_next(element)) {
+    Widget* widget =
+        Widget::GetWidgetForNativeWindow(GTK_WINDOW(element->data));
+    if (widget)
+      widget->LocaleChanged();
+  }
+  g_list_free(window_list);
+}
+
+// static
+void Widget::CloseAllSecondaryWidgets() {
+  GList* windows = gtk_window_list_toplevels();
+  for (GList* window = windows; window;
+       window = g_list_next(window)) {
+    Widget* widget = Widget::GetWidgetForNativeView(GTK_WIDGET(window->data));
+    if (widget && widget->is_secondary_widget())
+      widget->Close();
+  }
+  g_list_free(windows);
+}
+
+// static
+bool Widget::ConvertRect(const Widget* source,
+                         const Widget* target,
+                         gfx::Rect* rect) {
+  DCHECK(source);
+  DCHECK(target);
+  DCHECK(rect);
+
+  // TODO(oshima): Add check if source and target belongs to the same
+  // screen.
+
+  if (source == target)
+    return true;
+  if (!source || !target)
+    return false;
+
+  gfx::Point source_point = source->GetWindowScreenBounds().origin();
+  gfx::Point target_point = target->GetWindowScreenBounds().origin();
+
+  rect->set_origin(
+      source_point.Subtract(target_point).Add(rect->origin()));
+  return true;
+}
+
+namespace internal {
+
+////////////////////////////////////////////////////////////////////////////////
+// NativeWidgetPrivate, public:
+
+// static
+NativeWidgetPrivate* NativeWidgetPrivate::CreateNativeWidget(
+    NativeWidgetDelegate* delegate) {
+  return new NativeWidgetGtk(delegate);
+}
+
+// static
+NativeWidgetPrivate* NativeWidgetPrivate::GetNativeWidgetForNativeView(
+    gfx::NativeView native_view) {
+  if (!native_view)
+    return NULL;
+  return reinterpret_cast<NativeWidgetGtk*>(
+      g_object_get_data(G_OBJECT(native_view), kNativeWidgetKey));
+}
+
+// static
+NativeWidgetPrivate* NativeWidgetPrivate::GetNativeWidgetForNativeWindow(
+    gfx::NativeWindow native_window) {
+  if (!native_window)
+    return NULL;
+  return reinterpret_cast<NativeWidgetGtk*>(
+      g_object_get_data(G_OBJECT(native_window), kNativeWidgetKey));
+}
+
+// static
+NativeWidgetPrivate* NativeWidgetPrivate::GetTopLevelNativeWidget(
+    gfx::NativeView native_view) {
+  if (!native_view)
+    return NULL;
+
+  NativeWidgetPrivate* widget = NULL;
+
+  GtkWidget* parent_gtkwidget = native_view;
+  NativeWidgetPrivate* parent_widget;
+  do {
+    parent_widget = GetNativeWidgetForNativeView(parent_gtkwidget);
+    if (parent_widget)
+      widget = parent_widget;
+    parent_gtkwidget = gtk_widget_get_parent(parent_gtkwidget);
+  } while (parent_gtkwidget);
+
+  return widget && widget->GetWidget()->is_top_level() ? widget : NULL;
+}
+
+// static
+void NativeWidgetPrivate::GetAllChildWidgets(gfx::NativeView native_view,
+                                             Widget::Widgets* children) {
+  if (!native_view)
+    return;
+
+  Widget* widget = Widget::GetWidgetForNativeView(native_view);
+  if (widget)
+    children->insert(widget);
+  gtk_container_foreach(GTK_CONTAINER(native_view),
+                        EnumerateChildWidgetsForNativeWidgets,
+                        reinterpret_cast<gpointer>(children));
+}
+
+// static
+void NativeWidgetPrivate::ReparentNativeView(gfx::NativeView native_view,
+                                             gfx::NativeView new_parent) {
+  if (!native_view)
+    return;
+
+  gfx::NativeView previous_parent = gtk_widget_get_parent(native_view);
+  if (previous_parent == new_parent)
+    return;
+
+  Widget::Widgets widgets;
+  GetAllChildWidgets(native_view, &widgets);
+
+  // First notify all the widgets that they are being disassociated
+  // from their previous parent.
+  for (Widget::Widgets::iterator it = widgets.begin();
+       it != widgets.end(); ++it) {
+    // TODO(beng): Rename this notification to NotifyNativeViewChanging()
+    // and eliminate the bool parameter.
+    (*it)->NotifyNativeViewHierarchyChanged(false, previous_parent);
+  }
+
+  if (gtk_widget_get_parent(native_view))
+    gtk_widget_reparent(native_view, new_parent);
+  else
+    gtk_container_add(GTK_CONTAINER(new_parent), native_view);
+
+  // And now, notify them that they have a brand new parent.
+  for (Widget::Widgets::iterator it = widgets.begin();
+       it != widgets.end(); ++it) {
+    (*it)->NotifyNativeViewHierarchyChanged(true, new_parent);
+  }
+}
+
+// static
+bool NativeWidgetPrivate::IsMouseButtonDown() {
+  bool button_pressed = false;
+  GdkEvent* event = gtk_get_current_event();
+  if (event) {
+    button_pressed = event->type == GDK_BUTTON_PRESS ||
+        event->type == GDK_2BUTTON_PRESS ||
+        event->type == GDK_3BUTTON_PRESS;
+    gdk_event_free(event);
+  }
+  return button_pressed;
+}
+
+}  // namespace internal
+}  // namespace views